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A104
1. Technical Specifications
Particular
Key Matrix For Flashing
Chipset
Android Version
Frequency
Network Mode
ROM
RAM
Internal SD Card memory
Expandable Memory
Factory mode code
Remarks
NA
MT6571A/E
Android 4.4.2
1.3Ghz
GSM900/1800
4G
512M
TBD
TBD
*#*#3646633#*#*
L2 Service Manual
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Summary of Contents for cromax A104
- Page 1 A104 L2 Service Manual 1. Technical Specifications Particular Remarks Key Matrix For Flashing Chipset MT6571A/E Android Version Android 4.4.2 Frequency 1.3Ghz Network Mode GSM900/1800 512M Internal SD Card memory Expandable Memory Factory mode code *#*#3646633#*#*...
- Page 2 A104 L2 Service Manual 2. CAUTIONS I. Flashing & Servicing must be undertaken by qualified personnel only. II. Ensure all work is carried out at an anti-static workstation and that an anti-static wrist strap is worn. III. Use only approved Tools & components as specified in the parts list.
- Page 3 A104 L2 Service Manual 2) LCD Description Reason Solution LCD FPC isn’t assemble in Reassemble LCD FPC LCD segments missing, Fading, place Contrast issue, Black lines, Color LCD FPC is broken Change the LCD issue, Backlight issue, Blank display, MB is broken Refer to L3 service manual Bad pixel, Flickering.
- Page 4 A104 L2 Service Manual 3) LCD Display Issue Description Reason Solution LCD issue Change LCD LCD doesn’t display MB doesn’t working Refer to L3 service manual 4) Touchpad Description Reason Solution FPC isn’t assembled in place Reassemble the FPC FPC is broken Change the TP TP doesn’t work and the light...
- Page 5 A104 L2 Service Manual Take off the TP, and then check and test if it is working normally use the jig and fixture. Test the mainboard if it is OK by the PCBA jig and fixture. 5) Light Sense Description...
- Page 6 A104 L2 Service Manual 6) G-sensor Description Reason Solution G-sensor doesn’t work MB is broken Refer to L3 service manual...
- Page 7 A104 L2 Service Manual 7) Keypad Description Reason Solution Keypad FPC is not well Re-solder No responding to keypad Touching is not well Change the side key FPC...
- Page 8 A104 L2 Service Manual 8) Charging Description Reason Solution Data cable issue Change the data cable I/O connector Change the I/O connector No charging Charger issue Change the charger Refer to L3 service manual Data cable issue Change the data cable...
- Page 9 A104 L2 Service Manual 9) USB Description Reason Solution Data cable issue Change the data cable I/O connector Change the I/O connector No charging Charger issue Change the charger Refer to L3 service manual Cannot use DATA D+ or D- is broken...
- Page 10 A104 L2 Service Manual 10) Main Camera Description Reason Solution Connection issue Re-connecting Camera ready/not Camera issue Change the camera working/no function Refer to L3 service manual Front camera can’t open Camera issue Change the front camera Rear camera can’t open...
- Page 11 A104 L2 Service Manual 11) Front Camera Description Reason Solution Connection issue Re-connecting Camera ready/not Camera issue Change the camera working/no function Refer to L3 service manual Front camera can’t open Camera issue Change the front camera Rear camera can’t open...
- Page 12 A104 L2 Service Manual 12) Vibrator Description Reason Solution Soldering issue Re-solde the vibrator Vibrator issue Change the Vibrator No vibration Refer to L3 service manual Assemble issue Reassemble the vibrator Vibrator 13) Playing Video Description Reason Solution Software issue...
- Page 13 A104 L2 Service Manual 14) Internet not working Description Reason Solution The coaxial cable assembly issue Reassemble GSM antenna assembly issue Reassemble SIM card broken Change a new SIM card No signal RF IC issue Refer to L3 service manual...
- Page 14 A104 L2 Service Manual 16) WI-FI/Bluetooth Description Reason Solution Wifi\BT antenna bracket assembly issue Re-assemble No signal MB is broken Refer to L3 service manual Wifi antenna Bluetooth antenna 17) GPS Description Reason Solution Wifi\BT antenna bracket assembly issue Re-assemble...
- Page 15 A104 L2 Service Manual 18) FM/Radio Description Reason Solution Earphone issue Change a new earphone No signal Earphone Jack of mainboard issue Refer to L3 service manual Earphone Jack 19) Earphone Description Reason Solution earphone issue Change a new earphone...
- Page 16 A104 L2 Service Manual 20) Loud Speaker Description Reason Solution The SPK with dust Clean the SPK Speaker foam issue Change it Noise/crack Speaker issue Change it Refer to L3 service manual Connection issue Assembly it again No volume/low volume...
- Page 17 A104 L2 Service Manual 21) MIC Description Reason Solution There is dust with MIC Clean the MIC Solder issue Re-solder it MIC issue Change the MIC Noise with uplink side The main LINK FPC assembly Reassemble the Link FPC issue...
- Page 18 A104 L2 Service Manual 22) Receiver Description Reason Solution There is dust with receiver Clean the receiver Noise/crack Receiver issue Change it Refer to L3 service manual Connection issue Assembly it again No voice/ volume low Receiver issue Change it...
- Page 19 A104 L2 Service Manual 23) Battery Description Reason Solution Show charging but it is not charged Charging IC issue Change PCBA Battery issue Change the battery Cannot be full charged Charging IC issue Change PCBA No charging Charging IC issue...
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